Radio apparatus



Jan. 3, 1928. 1,655,372

A. A. KENT RADIO APPARATUS Filed June 19, 1924 3 Sheets-Sheet l @um Wi MMM MAQ@

ATTORNEY.

Jan. 3, 1928.

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Jan. 3, 1928. 1,655,372

A. A. KEN1' RADIO APPARATUS Filed June 19, 1924 S Sheets-Sheet I5 P mm BY @LE/@w ATTORNEY.

Patented 1J an. 3, 1928.

ARTHUR ATWATER KENT, OF ABITMORE, PENNSYLVANIA.

RADIO APPARATUS.

Application led June 19,

My invention relates to radio receiving apparatus and more particularly to structure for mounting the various elements and parts upon a panel to form a compact unit.

In accordance with my invention I provide a plate or panel of sheet metal having secured thereto an element of such character and so positioned as to stilfen the plate or panel to hold it fiat and prevent it from bowing, buckling or warping; and upon the panel and stiifening element are mounted the various parts or devices of the receiving apparatus, some of them operable from the front of the panel, and all forming with the panel and its stiifening member a unit suitable for application to a cabinet or box.

Furth-er in accordance with my invention the panel structure is connected to earth or counterpoise capacity, andparticularly when there is supported thereby one or more. radio frequency variable tuning devices requiring the approach of the body or hand of the operator.

My invention resides in the features of structure, combination and arrangement of parts of the character hereinafter described and claimed.

For an illustration of one of the various forms my invention may take reference is to be had to the accompanying drawings in which:

Fig. 1 is a front elevational view of a cabinet having my structure applied thereto.

Fig. 2 is a horizontal sectional view, partly in plan, on the line 2 2 of Fig. l.

Fig. 3 is a vertical sectional View, parts in elevation, taken on the line 3-3 of Fig. 2.

Figs. 4, 5 and 6 are vertical sectional views, partly in elevation, taken, respectively, on the lines 4-4, -and 6-6 of Fig. 2. a

Fig. 7 is a view in perspectiveof the rear of the panel structure.

Fig. 8 is a diagrammatic view of a circuit in' which the various parts supported by the panel structure are connected.

Fig. 9 is afragmentary front elevational view of the panel having an index member applied thereto.

Fig. 10 isa vertical sectional view taken on the line lO-lO of Fig. 9.

Fig. 11 is a perspective view of the index element.

Referring to the drawings, l is the bottom of a housing, cabinet or box of wood, or

1924. Serial No. 720,890.

ing the top 4 are the strips 7 to which are secured by screws 8 the sheet metal plate or panel P of iron, steel, aluminum, brass or other similar suitable material. Secured to the panel P adjacent and substantially parallel to its lower edge is the ledge or stifening member L preferably of sheet metal, having the integral flange 9 spot welded or otherwise secured to the panel P. The member L with its flange 9 is 1n etfect an angle member which, particularly due to the width of the ledge L, stitfens the panel 4l? as ak whole, preventing it from bowing. buckling or warping, and causing it to remain fiat permitting easy fastening by screws 8 to the box or cabinet structure, without bowing or buckling between the screws.

There are mounted upon the panel P and the ledge L various parts or devices of the radio receiving apparatus. In the example illustrated the receiving apparatus comprises two stages of radio frequency amplification, a detector and two stages of audio frequency amplification.

In Fig. 8 there is shown by way of example a diagram of the circuit arrangement. The antenna A is connected to binding post 48, which in turn is connected to the movable switch blade 49 coacting with several contacts 50 connected respectively through suitable taps to different points in the winding 10, whose one terminal connects through binding post 5l to earth or counter-capacity E and whose other terminal connects to the grid of the tube V. The switch comprising the movable contact 49 and contacts 50 is mounted upon the panel P. Shunting the inductance 10 is the variable tuning condenser C whose terminals are connected to the grid-filament circuit of the radio frequency amplifier tube V in whose anode circuit is connected the primary winding 11 of the radio frequency transformer T whose secondary l2, shunted by the variable tuning condenser C1, is connected to the grid-filament circuit of the second radio frequency amplifier tube V1 in whose anode circuit is the primary 13 of a radio frequency transformer T1 whose secondary 14, shunted by the variable tuning condenser C2, is connected on lthe one'handto vtheffilari-lent of the detector tube V2 `and at its other terminal to the grid of the tube V2 through the grid condenser K shunted bythe rid leak resistance 15. In the anode circuit of the` tube V2 isy the primary 16 of an audio frequency transformer T2, shunted by thev bypass condenser K1. 4'.llhe secondary 17 is `other terminal of the filaments of the tubes "V and V1 is yconnected to the conductor 24 which connects 'through the variable resistance or rheostat 25 and switch 26 with the binding post 27 connecting with the negative terminal of the A battery. The binding post -27 connects also through the switch 26 and the variable resistance or lrheostat 28 with the conductor 29 connecting with the remaining terminals of the filaments of the tubes V2, V3 and V4. The binding post 30 connecting with the positive terminal of the low voltage B battery connects through conductor'31 with the anode circuit of the detector tube V2; and the binding post 32 conl necting with the positive terminal of the high voltage B battery connects through conductor 33 with the anode circuits of the tubes V, V1, V3 and V4. Y

The conductor 24 as shown is lconnected to the earth or vcounterpoise capacity E andthe panel structure, either the panel P itself or the ledge member L, is connected-to earth or counter capacity E, as indicated by conductor 34.

Each of the conductors C, C1 and C2 comprises, as indicated in'Fig. 4, the rotatable armature plates 35 co-acting in well known manner with suitable stationary armature plates 36, and carried' upon a rotatable shaft having bearings carried by the supporting members 37 and 38 to which the member 37 is secured by screws 39 to the rear face of the panel P, the shaft extending freely through the panel and havin secured upon its outer end the dial 40 having the operating'handle or knob 41.

The inductance 10 is wound upon the cylinder 42 of insulating material, which latter is supported by brackets 43 upon the condenser member 38. The radio frequency transformers T and T1 are similarly sup- `portedupon the corresponding members 38 ost 23'with which areconnected the ofthe condensers C1' amtlich-respectively'.

,As indicated, the axes of the inductance y10 and transformers T and T1r lare at right` angles to eachother.

upon the metallic plateI l itself Athe three unas, 0,10, .01,'r-and earl. ff i Between the first two of posed a socket unit for the tube V, said 'unit comprising a base member 44`of insulating material secured by screws 45 to the metallic f ledge L. As indicated, the base or support- /ing member 44 overhangs or extends beyond the edge of the ledve L in a horizontal direction. Secured 1 on the base 44 is the socket sleeve""`46lin which is received and held the tube V, by structure Well understood in th'e art, with the tube terminals coming into register with suitable yielding spring terminals 47. The binding post 48, carried'by the base member 44, is adapted tobe connectedV to the antenna, as by lead lall disposedA There are vaccordingly lsupported directlyA said units is dis-v extending to the antenna through the hole 52 in the rear wall 2 of the box.

The conductor 24 may connect, for example, with the binding post 51, to which may be connected a lead extending to earth` or ground E through the hole 53 in the rear Y Wall 2 of the cabinet.

Similarly, between the units C1,T and 02,'11 is secured by screws 45 upon the ledge member L the base 54, preferably of insulating material, provided with the socket shell 55 for the tube V1.

y To the right of the condenser C2, Fig. 2, there is secured by screws 56 upon the front face of the panel P the base 57 'of insulating' material, carrying the aforesaid rheostat reslstances 25 and 28, and the A. battery switch 26. The movable contact of the rheo-'f stat 25 controlling the filaments of the tubes V and` V1, is rotatable by the .rotatable knob o'r handle 58 carried by the base 57; -and simllarly, the movable contact of the 'rheustat 28, controlling the filaments of the three lll) remaining tubes, is rotatable by the knob or handle 59 mounted upon the base' 57.-

Secured to and preferably overhanging the ledge L, to the right of the unit 02,'1, is the base 60 of insulating material held to ledge L by screws 61. Upon this base are supported the socket sleeves 62, 63 and V64 for the tubes V2, V3 and V4 respectively; there are also `mounted upon the base 60 the grid leak resistance 15 and the "audio lli;

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and connected to the several parts and devices in the manner indicated in the diagram.

In the angle between the ledge L and its fiange t) is disposed the bypass condenser K as indicated in Figs. 3 and 5. It is held by a metal bracket or clip 67 held by screw (S8 to the ledge L. This screw, making metallic contactwith the ledge L, which in turn is lnetallically connected with the panel l, may beI utilized for making the ground connection with the panel P as by securing by a screw 68 a conductor extending to and connecting with the aforesaid ground binding post 51.

Referring to Figs. 9, 10 and 11 there is shown a pointer or index G9 of German silver or other metal or'. material having the rearwardly extending prongs 70 extending through holes in the panel P and then bent parallel to the panel as indicated in Fig. 10, for holding the index (it) in fixed position upon the panel. The lower end ot' the index (39 is disposed adjacent each of the condenser or ether dials 40 each of which carries suitable inarkings or graduations co-acting with the index mark 71 on member 69 for assist.- ing in adjustment and repeating adjustments of the condensers or other similar variable instrun'ients.

From the foregoing description it isapparent that all of the parts and devices of the receiving apparatus are supported upon the panel structure, some of them upon the panel proper and some upon the ledge or stiftening member. By raising the cover 5 access to the interior of the cabinet is had and upon disconnecting the antenna, ground, battery and telephone leads the entire receiving apparatus may be removed as a. unit upon removal of the screws 8.

The panel structure is stift and remains itat, whereby it may with facility be applied to a. cabinet or the like and whereby it rigidly supports all of the instruments, parts or devices and maintains them strictly in predetermined and fixed relations With respect to each other. Furthermore, the approach ot'I the body or hand of an operator as to any of the handles or knobs 4l, 58 and 5S) produces no capacity etfect, especially upon the radio frequency circuits, because of the groululing of the metallic panel structure or because of its connection with suitable part of the radio frequency circuit or circuits.

A panel l? of metal is further of advantage in that there may be applied thereto,

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decorative finishes producing mottled, frosted and other effects not suitable to or convenient with panels of wood or other nonmetallic materials.

1 The combination With a housing, of a panel structure forming a detachable wall of said housing and comprising a sheet metal stantial extent normal thereto for stitfening said panel substantially throughout its entire extent, radio receiving apparatus carried by said panel struct-ure Wit-hin said housing and removable asr a unit with said panel structure, and a connection from said panel structure and said receiving apparatus extending to ground.

3. The combination with a housing, of

panel structure forming a detachable Wall of said housing and comprising a sheet metal panel and a member secured thereto and having substantial extent normal thereto for stii'ening said panel substantially throughout its entire extent, and radio receiving apparatus all of Whose devices are carried solely by said panel structure Within said housing and are removable as a unit with said panel structure.

4. The combination with a housing, of panel structure forming a Wall thereof and comprising a sheet metal panel and a meniber secured thereto and having substantial extent normal thereto for stiifening said panel substantially throughout its entire extent, said member forming a ledge upon said panel Within said housing, and radio receiving apparatus comprising devices carried respectively by said panel and said ledge Within said housing and removable as a unit with said panel and ledge.

5. Radio receiving apparatus comprising panel structure comprising a sheet metal member and a sheet metal ledOfe having a flange intimately united With said panel for stiffening said panel throughout substantially its entire extent, tuning apparatus carried by said panel structure, and an electrical connection from said panel structure to a part of said tuning apparatus.

6. Radio receiving apparatus comprising panel structure comprising a sheet meta-l panel and a member secured thereto and having substantial extent normal thereto for stilfening said panel throughout substantially its entire extent, tuning means carried by said panel, and vacuum tube mounting structure carried by said member.

7. Radio receiving apparatus comprising a sheet metal panel, metal ledge structure secured thereto and stiftening said panel throughout substantially its entire extent, an insulating member secured to said ledge member and overhanging said ledge member,

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and a tube socket carried by said insulating member.

8. Radio receiving apparatus comprising a sheet metal panel, metal ledge structure secured thereto and sti tfening said panel throughout substantially its entire extent, an insulating member secured to said ledge member and overhanging said ledge member, a tube socket carried by said insulating member, and tuning means secured to said panel.

9. Radio receiving apparatus comprising a sheet metal panel, metal ledge structure secured thereto and stiffening said panel throughout substantially its entire extent, an insulating member secured to l'said iledge member and overhanging said ledge member, a tube socket carried by said insulating member, and a tuning unit comprising a winding and a variable condenser carried by said panel.

10. Radio receiving apparatus comprising a sheet metal panel, metal ledge structure sccured thereto and stiffening said panel throughout substantially its Ytentire extent, an insulating member secured to said ledge member and overhanging said ledge member, a tube socket carried by said insulating member, and tuning devices carried by said panel on opposite sides of said socket.

11. In radio receiving apparatus, the combination with panel structure comprising a sheet metal panel member and sheet metal ledge structure `secured thereto and having substantial extent substantially normal to the plane of said panel member, of radio receiving apparatus all of Whose devices-are carried by said panel structure, part by said panel member and part by -said ledge structure.

12. In radio receiving apparatus, panel structure comprising a metal panel, metal ledge structure Welded thereto and. having substantial extent substantially normalto said panel for stiti'ening said panel, and radio receiving devices carried respectively by said panel and ledge structure.

13. In radio receiving apparatus, panel structure comprising a metal panel, metal ledge structure welded thereto and having substantial extent substantially normal to said panel for stiiening said panel, a member of insulating material secured to -Said ledge structure and over-hanging the same, and a vacuum tube holder carried by said last named member.

14. In radio receiving apparatus, panel structure comprising a metal panel, metal ledge structure Welded thereto and having substantial extent substantially normal to said panel for stilfening said panel, a member of insulating material secured to said .ledge structure and over-hanging the same, a plurality ofvaeuum tube holders carried by said last named-member, and an intertube transformer carried by said last named member. v

15. Radio receiving apparatus comprising a housing, a sheet metal panel constituting a detachable Wall of the housing, sheet metal structure extending longitudinally of the panel normally thereto for st-itfening it substantially throughout is entire length, an internal fiange on such sheet metal structure Welded upon said panel, and devices ot radio receiving apparatus carried respectively by said panel and said sheet metal structure.

ARTHUR ATWATER KENT. 

